Class 1 Class 2 Class 3 Test items Superior grade A first-rate product Acceptable product A first-rate product Acceptable product Sodium Sulphide Na2S % 60 60 60 60 60 65 Sodium....
Xinjiang Huaxing Youbang Trading Co., Ltd is a company specializing in domestic and international trade business, mainly engages in machinery of geological exploration, oil and coal mining, mining....